JReport of the State Entomologist. 105 



A section of a cherry tree before me, of two inches diameter, shows 

 still greater destruction of the surface of the sapwood. The bur- 

 rows are so close that they can not be separated. In a space of one 

 square inch, thirty-two holes made for pupation can be counted. 



I have not been able in the specimens of infested wood received, 

 to make out the " mating chamber " of the beetles, or as termed by 

 some writers, " the cradle." They were probably in the lateral 

 branches which had been removed. Dr. Hagen states that " the 

 cradle is i^erpendicular in most cases except where it begins just 

 below the base of a bud, and is about an inch long." He further 

 adds of the burrows: " The galleries are [sic.] to four inches long, and 

 rather deeply injuring the sapwood. The holes for the pupa go 

 deeply, to 4 mm. in the wood " {loc. cit). 



Mr. Scudder, in referring to a mine of an European example of 

 rugulosus on cherry, in the Museum of Comparative Zoology at 

 Cambridge, Mass., states: "The larval mines emerge and diverge 

 from one point of the mating chamber. The main galleries [cradles] 

 are reduced to almost nothing, and the normal mine of this species, as 

 figured by Ratzeburg, shows nothing of the kind " {loc. cit). 



Strongly Attacked by Parasites. 

 Fortunately, the beetle has been met by a strong j)arasitic attack, 

 which it is hoped will not permit of a great increase of its injuries. 

 From *S'. rugulosus infested wood sent from Virginia on the twenty- 

 third of December, examples of a chalcid emerged two days after its 

 reception, fi-om which it would seem that others may have been dis- 

 closed at an earlier date. These were sent to the Division of Ento- 

 mology at Washington for identification, where they were referred to 

 the Pteromalid genus Raphitelus, of uncertain sj^ecies, but probably 

 maculatus — - identical with some that had been bred at the Depart- 

 ment from the same insect infesting other fruit trees in Ohio and 

 North Carolina. 



Later — in January and February — another species of chalcid 

 appeared, characterized by two subquadrate spots on the fore-wing, 

 which Mr. Howard kindly identified as Chiroj^achys colon (Linn.). A 

 third species, obtained more numerously than either of the two preced- 

 ing, was referable, according to Mr. Howard, to the genus Eurytoma — 

 species not ascertained. 



Its Injuries to Cherry, Plum, and Peach Trees. 

 Frequent complaints have been made within the last few years of 

 the injuries of Scolytus rugtdosus to cherry, plum, and peach trees. 

 29 



